<style>
  span.rating {
    font-size: 2.4em;
    height: 48px;
    width: 48px;
  }

  div.rating {
    display: flex;
    align-items: center;
    justify-content: center;
  }
</style>
<div class="rating">
  <span class="icon star_outline rating" value="1"></span>
  <span class="icon star_outline rating" value="2"></span>
  <span class="icon star_outline rating" value="3"></span>
  <span class="icon star_outline rating" value="4"></span>
  <span class="icon star_outline rating" value="5"></span>
</div>